Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events
Abstract This work examines precursory atmospheric circulations with various wave trains contributing to extreme cold weather over central Eurasia in boreal winter from 1979 to 2019. By conducting extended empirical orthogonal function (EEOF) on the preceding propagation circulation fields 2 weeks b...
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crwiley:10.1002/joc.8053 2024-06-02T08:02:44+00:00 Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events Zhuo, Wenqin Huang, Fei Ding, Ruichang Luo, Jin National Natural Science Foundation of China 2023 http://dx.doi.org/10.1002/joc.8053 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8053 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.8053 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8053 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 43, issue 8, page 3698-3709 ISSN 0899-8418 1097-0088 journal-article 2023 crwiley https://doi.org/10.1002/joc.8053 2024-05-03T12:02:39Z Abstract This work examines precursory atmospheric circulations with various wave trains contributing to extreme cold weather over central Eurasia in boreal winter from 1979 to 2019. By conducting extended empirical orthogonal function (EEOF) on the preceding propagation circulation fields 2 weeks before the onset of extreme cold event (ECE) cases, three types of ECEs with different disturbance origins are classified and analysed. Type 1 denotes the positive phase of EEOF mode 1, shows as negative phase of Arctic Oscillation‐like pattern. The outbreak of this type of ECE is affected by a wave train originating from Baffin Bay, where an anomalous anticylonic system persisted under a background of weakened westerlies over middle‐high latitudes. Type 2 is picked from positive phase of EEOF mode 2, manifests as a developing blocking system that forms over Scandinavia and shifts to the Barents area. It is found that the blocking system is mainly strengthened by the downstream dispersion process of wave packets that are generated at the northern exit area of the North Pacific westerly jet, where exist anomalous cyclonic zonal wind shear and precipitation. Type 3 is selected from the negative phase of EEOF mode 2, which has a similar origin to type 2 but with the North Pacific jet exit more southward. Then, the generated wave packets propagate to Europe along the northerly jet stream over the North Atlantic, which acts as a waveguide and extends the wave train to downstream. In a word, these three types of precursory atmospheric wave train patterns that bring extreme cold anomalies to Eurasia possess diverse disturbing sources and downstream development mechanisms, and the essential role of the westerly jet is further highlighted. The results, which are investigated based on a quasi‐biweekly time scale, may deepen our understanding of the atmospheric genesis of extreme weather and improve extended‐range weather forecast. Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin North Atlantic Wiley Online Library Arctic Baffin Bay Pacific International Journal of Climatology 43 8 3698 3709 |
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English |
description |
Abstract This work examines precursory atmospheric circulations with various wave trains contributing to extreme cold weather over central Eurasia in boreal winter from 1979 to 2019. By conducting extended empirical orthogonal function (EEOF) on the preceding propagation circulation fields 2 weeks before the onset of extreme cold event (ECE) cases, three types of ECEs with different disturbance origins are classified and analysed. Type 1 denotes the positive phase of EEOF mode 1, shows as negative phase of Arctic Oscillation‐like pattern. The outbreak of this type of ECE is affected by a wave train originating from Baffin Bay, where an anomalous anticylonic system persisted under a background of weakened westerlies over middle‐high latitudes. Type 2 is picked from positive phase of EEOF mode 2, manifests as a developing blocking system that forms over Scandinavia and shifts to the Barents area. It is found that the blocking system is mainly strengthened by the downstream dispersion process of wave packets that are generated at the northern exit area of the North Pacific westerly jet, where exist anomalous cyclonic zonal wind shear and precipitation. Type 3 is selected from the negative phase of EEOF mode 2, which has a similar origin to type 2 but with the North Pacific jet exit more southward. Then, the generated wave packets propagate to Europe along the northerly jet stream over the North Atlantic, which acts as a waveguide and extends the wave train to downstream. In a word, these three types of precursory atmospheric wave train patterns that bring extreme cold anomalies to Eurasia possess diverse disturbing sources and downstream development mechanisms, and the essential role of the westerly jet is further highlighted. The results, which are investigated based on a quasi‐biweekly time scale, may deepen our understanding of the atmospheric genesis of extreme weather and improve extended‐range weather forecast. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Zhuo, Wenqin Huang, Fei Ding, Ruichang Luo, Jin |
spellingShingle |
Zhuo, Wenqin Huang, Fei Ding, Ruichang Luo, Jin Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events |
author_facet |
Zhuo, Wenqin Huang, Fei Ding, Ruichang Luo, Jin |
author_sort |
Zhuo, Wenqin |
title |
Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events |
title_short |
Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events |
title_full |
Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events |
title_fullStr |
Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events |
title_full_unstemmed |
Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events |
title_sort |
precursory atmospheric circulations with rossby wave trains leading to eurasian extreme cold events |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/joc.8053 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8053 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.8053 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8053 |
geographic |
Arctic Baffin Bay Pacific |
geographic_facet |
Arctic Baffin Bay Pacific |
genre |
Arctic Baffin Bay Baffin Bay Baffin North Atlantic |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin North Atlantic |
op_source |
International Journal of Climatology volume 43, issue 8, page 3698-3709 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.8053 |
container_title |
International Journal of Climatology |
container_volume |
43 |
container_issue |
8 |
container_start_page |
3698 |
op_container_end_page |
3709 |
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1800747214457274368 |